/*
 *  $Id$
 */

/*
 * asc2log.c - convert ASC logfile to compact CAN frame logfile
 *
 * Copyright (c) 2002-2007 Volkswagen Group Electronic Research
 * All rights reserved.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions
 * are met:
 * 1. Redistributions of source code must retain the above copyright
 *    notice, this list of conditions, the following disclaimer and
 *    the referenced file 'COPYING'.
 * 2. Redistributions in binary form must reproduce the above copyright
 *    notice, this list of conditions and the following disclaimer in the
 *    documentation and/or other materials provided with the distribution.
 * 3. Neither the name of Volkswagen nor the names of its contributors
 *    may be used to endorse or promote products derived from this software
 *    without specific prior written permission.
 *
 * Alternatively, provided that this notice is retained in full, this
 * software may be distributed under the terms of the GNU General
 * Public License ("GPL") version 2 as distributed in the 'COPYING'
 * file from the main directory of the linux kernel source.
 *
 * The provided data structures and external interfaces from this code
 * are not restricted to be used by modules with a GPL compatible license.
 *
 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
 * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
 * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
 * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
 * OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
 * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
 * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
 * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH
 * DAMAGE.
 *
 * Send feedback to <socketcan-users@lists.berlios.de>
 *
 */

#include <stdio.h>
#include <string.h>
#include <sys/time.h>
#define __USE_XOPEN /* supress warning for strptime */
#include <time.h>
#include <libgen.h>
#include <unistd.h>
#include <stdlib.h>
#include <locale.h>

#include <net/if.h>
#include <linux/can.h>
#include <linux/can/error.h>

#include "lib.h"

extern int optind, opterr, optopt;

void print_usage(char *prg)
{
    fprintf(stderr, "Usage: %s\n", prg);
    fprintf(stderr, "Options: -I <infile>  (default stdin)\n");
    fprintf(stderr, "         -O <outfile> (default stdout)\n");
}

void prframe(FILE *file, struct timeval *tv, int dev, struct can_frame *cf) {

    fprintf(file, "(%ld.%06ld) ", tv->tv_sec, tv->tv_usec);
    if (dev > 0)
	fprintf(file, "can%d ", dev-1);
    else
	fprintf(file, "canX ");
    fprint_canframe(file, cf, "\n", 0);
}

void get_can_id(struct can_frame *cf, char *idstring, int base) {

    if (idstring[strlen(idstring)-1] == 'x') {
	cf->can_id = CAN_EFF_FLAG;
	idstring[strlen(idstring)-1] = 0;
    } else
	cf->can_id = 0;
    
    cf->can_id |= strtoul(idstring, NULL, base);
}

void calc_tv(struct timeval *tv, struct timeval *read_tv,
	     struct timeval *date_tv, char timestamps, int dplace) {

    if (dplace == 4) /* shift values having only 4 decimal places */
	read_tv->tv_usec *= 100;                /* and need for 6 */

    if (timestamps == 'a') { /* absolute */

	tv->tv_sec  = date_tv->tv_sec  + read_tv->tv_sec;
	tv->tv_usec = date_tv->tv_usec + read_tv->tv_usec;

    } else { /* relative */

	if (((!tv->tv_sec) && (!tv->tv_usec)) && 
	    (date_tv->tv_sec || date_tv->tv_usec)) {
	    tv->tv_sec  = date_tv->tv_sec; /* initial date/time */
	    tv->tv_usec = date_tv->tv_usec;
	}

	tv->tv_sec  += read_tv->tv_sec;
	tv->tv_usec += read_tv->tv_usec;
    }

    if (tv->tv_usec > 1000000) {
	tv->tv_usec -= 1000000;
	tv->tv_sec++;
    }
}

int get_date(struct timeval *tv, char *date) {

    char ctmp[10];
    int  itmp;

    struct tm tms;

    if (sscanf(date, "%9s %d %9s %9s %d", ctmp, &itmp, ctmp, ctmp, &itmp) == 5) {
	/* assume EN/US date due to existing am/pm field */

	if (!setlocale(LC_TIME, "en_US"))
	    return 1;

	if (!strptime(date, "%B %d %r %Y", &tms))
	    return 1;

    } else {
	/* assume DE date due to non existing am/pm field */

	if (sscanf(date, "%9s %d %9s %d", ctmp, &itmp, ctmp, &itmp) != 4)
	    return 1;

	if (!setlocale(LC_TIME, "de_DE"))
	    return 1;

	if (!strptime(date, "%B %d %T %Y", &tms))
	    return 1;
    }
    
    //printf("h %d m %d s %d d %d m %d y %d\n",
    //tms.tm_hour, tms.tm_min, tms.tm_sec,
    //tms.tm_mday, tms.tm_mon+1, tms.tm_year+1900);

    tv->tv_sec = mktime(&tms);

    if (tv->tv_sec < 0)
	return 1;

    return 0;
}

int main(int argc, char **argv)
{
    char buf[100], tmp1[100], tmp2[100];

    FILE *infile = stdin;
    FILE *outfile = stdout;
    static int verbose;
    struct can_frame cf;
    static struct timeval tv; /* current frame timestamp */
    static struct timeval read_tv; /* frame timestamp from ASC file */
    static struct timeval date_tv; /* date of the ASC file */
    static int dplace; /* decimal place 4 or 6 or uninitialized */
    static char base; /* 'd'ec or 'h'ex */
    static char timestamps; /* 'a'bsolute or 'r'elative */

    int interface;
    char rtr;
    int dlc = 0;
    int data[8];
    int i, found, opt;

    while ((opt = getopt(argc, argv, "I:O:v")) != -1) {
	switch (opt) {
	case 'I':
	    infile = fopen(optarg, "r");
	    if (!infile) {
		perror("infile");
		return 1;
	    }
	    break;

	case 'O':
	    outfile = fopen(optarg, "w");
	    if (!outfile) {
		perror("outfile");
		return 1;
	    }
	    break;

	case 'v':
	    verbose = 1;
	    break;

	default:
	    fprintf(stderr, "Unknown option %c\n", opt);
	    print_usage(basename(argv[0]));
	    return 1;
	    break;
	}
    }


    while (fgets(buf, 99, infile)) {

	if (!dplace) { /* the representation of a valid CAN frame not known */

	    /* check for base and timestamp entries in the header */
	    if ((!base) &&
		(sscanf(buf, "base %s timestamps %s", tmp1, tmp2) == 2)) {
		base = tmp1[0];
		timestamps = tmp2[0];
		if (verbose)
		    printf("base %c timestamps %c\n", base, timestamps);
		if ((base != 'h') && (base != 'd')) {
		    printf("invalid base %s (must be 'hex' or 'dez')!\n",
			   tmp1);
		    return 1;
		}
		if ((timestamps != 'a') && (timestamps != 'r')) {
		    printf("invalid timestamps %s (must be 'absolute'"
			   " or 'relative')!\n", tmp2);
		    return 1;
		}
		continue;
	    }

	    /* check for the original logging date in the header */ 
	    if ((!date_tv.tv_sec) &&
		(!strncmp(buf, "date", 4))) {

		if (get_date(&date_tv, &buf[9])) { /* skip 'date day ' */
		    fprintf(stderr, "Not able to determine original log "
			    "file date. Using current time.\n");
		    /* use current date as default */
		    gettimeofday(&date_tv, NULL);
		}
		if (verbose)
		    printf("date %ld => %s", date_tv.tv_sec, ctime(&date_tv.tv_sec));
		continue;
	    }

	    /* check for decimal places length in valid CAN frames */
	    if (sscanf(buf, "%ld.%s %d ", &tv.tv_sec, tmp2, &i) == 3){
		dplace = strlen(tmp2);
		if (verbose)
		    printf("decimal place %d, e.g. '%s'\n", dplace, tmp2);
		if ((dplace != 4) && (dplace != 6)) {
		    printf("invalid dplace %d (must be 4 or 6)!\n", dplace);
		    return 1;
		}
	    } else
		continue; /* dplace remains zero until first found CAN frame */
	} 

	/* the representation of a valid CAN frame is known here */
	/* so try to get CAN frames and ErrorFrames and convert them */

	/* 0.002367 1 390x Rx d 8 17 00 14 00 C0 00 08 00 */

	found = 0; /* found valid CAN frame ? */

	if (base == 'h') { /* check for CAN frames with hexadecimal values */

	    if (sscanf(buf, "%ld.%ld %d %s %*s %c %d %x %x %x %x %x %x %x %x",
		       &read_tv.tv_sec, &read_tv.tv_usec, &interface,
		       tmp1, &rtr, &dlc,
		       &data[0], &data[1], &data[2], &data[3],
		       &data[4], &data[5], &data[6], &data[7]
		       ) == dlc + 6 ) {

		found = 1;
		get_can_id(&cf, tmp1, 16);
	    }

	} else { /* check for CAN frames with decimal values */

	    if (sscanf(buf, "%ld.%ld %d %s %*s %c %d %d %d %d %d %d %d %d %d",
		       &read_tv.tv_sec, &read_tv.tv_usec, &interface,
		       tmp1, &rtr, &dlc,
		       &data[0], &data[1], &data[2], &data[3],
		       &data[4], &data[5], &data[6], &data[7]
		       ) == dlc + 6 ) {

		found = 1;
		get_can_id(&cf, tmp1, 10);
	    }
	}

	if (found) {
	    if (rtr == 'r')
		cf.can_id |= CAN_RTR_FLAG;
 
	    cf.can_dlc = dlc & 0x0FU;
	    for (i=0; i<dlc; i++)
		cf.data[i] = data[i] & 0xFFU;

	    calc_tv(&tv, &read_tv, &date_tv, timestamps, dplace);
	    prframe(outfile, &tv, interface, &cf);
	    fflush(outfile);
	    continue;
	}

	/* check for ErrorFrames */
	if (sscanf(buf, "%ld.%ld %d %s",
		   &read_tv.tv_sec, &read_tv.tv_usec,
		   &interface, tmp1) == 4) {
		
	    if (!strncmp(tmp1, "ErrorFrame", strlen("ErrorFrame"))) {

		memset(&cf, 0, sizeof(cf));
		/* do not know more than 'Error' */
		cf.can_id  = (CAN_ERR_FLAG | CAN_ERR_BUSERROR);
		cf.can_dlc =  CAN_ERR_DLC;
		    
		calc_tv(&tv, &read_tv, &date_tv, timestamps, dplace);
		prframe(outfile, &tv, interface, &cf);
		fflush(outfile);
	    }
	}
    }
    fclose(outfile);
    return 0;
}
